SDL 2.0 API by Category

Basics

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Initialization and Shutdown	SDL.h
Configuration Variables	SDL_hints.h
Error Handling	SDL_error.h
Log Handling	SDL_log.h
Assertions	SDL_assert.h
Querying SDL Version	SDL_version.h

Video

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Display and Window Management	SDL_video.h
2D Accelerated Rendering	SDL_render.h
Pixel Formats and Conversion Routines	SDL_pixels.h
Rectangle Functions	SDL_rect.h
Surface Creation and Simple Drawing	SDL_surface.h
Platform-specific Window Management	SDL_syswm.h
Clipboard Handling	SDL_clipboard.h

Input Events

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Event Handling	SDL_events.h
Keyboard Support	SDL_keyboard.h SDL_keycode.h SDL_scancode.h
Mouse Support	SDL_mouse.h
Joystick Support	SDL_joystick.h
Game Controller Support	SDL_gamecontroller.h

Force Feedback

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Force Feedback Support	SDL_haptic.h

Audio

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Audio Device Management, Playing and Recording	SDL_audio.h

Threads

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Thread Management	SDL_thread.h
Thread Synchronization Primitives	SDL_mutex.h
Atomic Operations	SDL_atomic.h

Timers

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Timer Support	SDL_timer.h

File Abstraction

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Filesystem Paths	SDL_filesystem.h
File I/O Abstraction	SDL_rwops.h

Shared Object Support

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Shared Object Loading and Function Lookup	SDL_loadso.h

Platform and CPU Information

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Platform Detection	SDL_platform.h
CPU Feature Detection	SDL_cpuinfo.h
Byte Order and Byte Swapping	SDL_endian.h
Bit Manipulation	SDL_bits.h

Power Management

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Power Management Status	SDL_power.h

Additional Functionality

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Platform-specific Functionality	SDL_system.h
Standard Library Functionality	SDL_stdinc.h